Question

这是myCode：

 private void frmChart_Load(object sender, EventArgs e)
    {
        string cs = ConfigurationManager.ConnectionStrings["dbcs"].ConnectionString;
        using (SqlConnection Con = new SqlConnection(cs))
        {
            SqlCommand cmdSum = new SqlCommand("Select distinct(UserName),sum(Value) from mytable  group by UserName",Con);
            Con.Open();
            SqlDataReader reader = cmdSum.ExecuteReader();
            chart1.DataBindTable(reader,"sum(Value)");
        }
        foreach (Series series in chart1.Series)
        {
            series.CustomProperties = "DrawingStyle=LightToDark";
        }

    }

它在chart1.DatabindTable中显示错误。我也尝试了另一种方法，但我无法处理它。

Answer 1

如果您要做的就是绑定数据表，那么就这样做：

        private void Form1_Load(object sender, EventArgs e)
        {
            string sql = "your sql here";

            SqlDataAdapter adapter = new SqlDataAdapter(sql, connectionString);
            DataTable dt = new DataTable();
            adapter.Fill(dt);
            chart1.DataBindTable(dt.DefaultView, "UserName");
        }

请注意，在调用DataBindTable时，您必须使用“UserName”（xField）。不是Value或Sum(Value)。

Answer 2

检查读者的价值观......如果你有价值观，

尝试替换

chart1.DataBindTable(reader,"sum(Value)");

带

chart1.DataBindTable(reader,"Value");

一旦将值汇总到查询中，您无需再次提及总和，您的Value参数将具有总和

编辑---更新了代码..

private void frmChart_Load(object sender, EventArgs e)
        {
            string cs = ConfigurationManager.ConnectionStrings["dbcs"].ConnectionString;
            using (SqlConnection Con = new SqlConnection(cs))
            {
                SqlCommand cmdSum = new SqlCommand("Select distinct(UserName),sum(Value) from mytable  group by UserName", Con);
                Con.Open();
                SqlDataReader reader = cmdSum.ExecuteReader();
                while (reader.Read())
                {
                    chart1.DataBindTable(reader, reader["Value"]);
                }

            }
            foreach (Series series in chart1.Series)
            {
                series.CustomProperties = "DrawingStyle=LightToDark";
            }

        }

如何将DataTable绑定到MS图表

2 个答案: